--- jsr166/src/main/java/util/HashMap.java	2018/07/05 15:18:56	1.6
+++ jsr166/src/main/java/util/HashMap.java	2018/08/10 19:35:20	1.7
@@ -2145,7 +2145,7 @@ public class HashMap<K,V> extends Abstra
             if (replacement != p) {
                 TreeNode<K,V> pp = replacement.parent = p.parent;
                 if (pp == null)
-                    root = replacement;
+                    (root = replacement).red = false;
                 else if (p == pp.left)
                     pp.left = replacement;
                 else